Android（Broadcast实现强制下线功能）

1、效果图：





2、文件：



3、ActivityCollector.java

package com.example.jcs.mybroadcastreceiverdemo;

import android.app.Activity;

import java.util.ArrayList;
import java.util.List;

//定义一个类来管理所有活动
public class ActivityCollector {

public static List<Activity> list = new ArrayList<Activity>();

public static void addActivity(Activity activity) {
list.add(activity);
}

public static void removeActivity(Activity activity) {
list.remove(activity);
}

public static void finishAll() {
for (Activity a : list) {
//遍历集合是否到最后一个
if (!a.isFinishing()) {
a.finish();
}
}

}

}

4、Base.java

package com.example.jcs.mybroadcastreceiverdemo;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;

public class Base extends AppCompatActivity {

private Receiver receiver;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//把当前的页面加到集合中
ActivityCollector.addActivity(this);
}

@Override
protected void onResume() {
super.onResume();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("com.example.jcs.mybroadcastreceiverdemo.FORCE_OFFLINE");
receiver = new Receiver();
registerReceiver(receiver, intentFilter);
}

@Override
protected void onPause() {
super.onPause();
//判断对象是否为空
if (receiver != null) {
unregisterReceiver(receiver);
receiver = null;
}

}

@Override
protected void onDestroy() {
super.onDestroy();
ActivityCollector.removeActivity(this);

}

//增加一个广播接收器
class Receiver extends BroadcastReceiver {

@Override
public void onReceive(final Context context, Intent intent) {

//对话框
AlertDialog.Builder dialog = new AlertDialog.Builder(context);
dialog.setTitle("警告");
dialog.setMessage("应用强制下线！");
dialog.setCancelable(false);
dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
//移除所有的页面
ActivityCollector.finishAll();
//在转到login
Intent intent = new Intent(context,Login.class);
context.startActivity(intent);
}
});
//PS:一定要show();
dialog.show();
}
}
}

5、Login.java

package com.example.jcs.mybroadcastreceiverdemo;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

/**
* Created by JCS on 2017/6/27.
*/
public class Login extends Base {
private EditText user_name;
private EditText password;
private Button btn;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login_activity);
user_name = (EditText) findViewById(R.id.user);
password = (EditText) findViewById(R.id.password);
btn = (Button) findViewById(R.id.login_btn);
btn.setOnClickListener(new Vi
4000
ew.OnClickListener() {
public void onClick(View view) {
String name = user_name.getText().toString().trim();
String pass = password.getText().toString().trim();
//判断账号密码
if (name.equals("admin") && pass.equals("123")) {
Intent intent = new Intent(Login.this, MainActivity.class);
startActivity(intent);
finish();
} else {
Toast.makeText(Login.this, "error", Toast.LENGTH_SHORT).show();
}

}
});
}
}

6、MainActivity.java

package com.example.jcs.mybroadcastreceiverdemo;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Base {
private Button btn;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.send_broadcast);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//点击就发送广播
Intent intent = new Intent("com.example.jcs.mybroadcastreceiverdemo.FORCE_OFFLINE");
sendBroadcast(intent);
}
});

}
}

7、activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.jcs.mybroadcastreceiverdemo.MainActivity">

<Button
android:id="@+id/send_broadcast"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送广播"
/>
</RelativeLayout>

8、login_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="账号："
/>
<EditText
android:id="@+id/user"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="账号："
/>
<EditText
android:id="@+id/password"
android:layout_width="match_parent"
android:layout_height="wrap_content" />

</LinearLayout>
<Button
android:id="@+id/login_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="登录"
/>
</LinearLayout>

9、清单文件：（把login为启动页面）

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity"></activity>
<activity android:name=".Login">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>